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Is there anyway to hook up a Tach to my sons 50

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I see where they have "1 spark = 1 revolution" and "2 sparks = 1 revolution", but wouldn't you need 1 spark = 2 revolutions for a single cylinder 4-stroke?

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Since the ignition is triggering off the crank it is firing every revolution even though it only needs it every other rev.

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